PHP: Call to undefined function bash

PHP: Call to undefined function bash_run() [closed]

I've two PHP files in the same directory testdev.

functions.php:

<?php
   function bash_run(string $cmd)
   {
      return shell_exec("/bin/bash -c " . $cmd);
   }

index.php:

<?php
   require "functions.php";

   if(isset($_GET["cmd"]))
      echo bash_run($_GET["cmd"]);
   else
      echo "No command.";

When I try to access http://myhost.com/testdev/index.php?cmd=ls it says:

Fatal error:  Uncaught Error: Call to undefined function bash_run() in /home/rakinar2/public_html/testdev/index.php:5
Stack trace:
#0 {main}
  thrown in /home/rakinar2/public_html/testdev/index.php on line 5

source https://stackoverflow.com/questions/68975624/php-call-to-undefined-function-bash-run

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